PDO SQLite无法绑定NOT IN表达式

这是代码：

<?php
$dbh = new PDO('sqlite:');
$dbh->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

$goodSql = 'SELECT number FROM (SELECT 1 number UNION SELECT 2) numbers WHERE number not in (2)';
echo json_encode($dbh->query($goodSql)->fetchAll(PDO::FETCH_NUM));

$badSql = 'SELECT number FROM (SELECT 1 number UNION SELECT 2) numbers WHERE number not in (?)';
$binds = ['2'];
$statement = $dbh->prepare($badSql);
$statement->execute($binds);
echo json_encode($statement->fetchAll(PDO::FETCH_NUM));
?>

第一条语句成功地从结果中排除了2.排除由内联SQL条件NOT IN(2)指定.

第二条语句未能从结果中排除2.通过条件NOT IN(？)中参数2的PDO绑定指定排除.

在PDO / MySQL中,这两个语句产生相同的结果.

怎么了？这是错误还是已记录了结果？

附言我已经在所有使用https://3v4l.org/otfDj的PHP版本上对此进行了测试,并获得了与5.6.0-5.6.30、7.0.0-7.2.0alpha2相同的结果.

解决方法:

这是因为execute将传递的参数视为字符串.

因此,您的查询变为

$badSql = 'SELECT number FROM (SELECT 1 number UNION SELECT 2) numbers WHERE number not in ("2")';

绝对没有结果等于“ 2”.

解决方案是像int这样绑定params的专有性：

$badSql = 'SELECT number FROM (SELECT 1 number UNION SELECT 2) numbers WHERE number not in (?)';
$binds = ['2'];
$statement = $dbh->prepare($badSql);
$statement->bindValue(1, '2', PDO::PARAM_INT);   // this is it
$statement->execute();
echo json_encode($statement->fetchAll(PDO::FETCH_NUM));

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